OL and Sword of Stalingrad is somewhat complicated, which is one of the reasons I wanted to take a month off when your previous OL was approaching.

Now, I've had some more experience and am "training" for the Sword of Stalingrad match in June. For instance we've played a dozen games with the Urban Combat cards. I suggest:

Mamayev Kurgan: from Stalingrad pack, it's a battle for the hill above Stalingrad (which is in the Sword of Stalingrad map), it uses Commissar, it's 8 medals, and with a dozen towns you can play a variant with Combat Cards;Pavlov: Hero of the Soviet Union: from Stalingrad pack, Commissar, 9 medals, Combat Cards;Red Barricades Factory: normal and try a variant with Urban Cards;"Tissu est dans iode": official scenario w/Urban Cards;
Hôtel Meurice: official scenario w/Urban Cards; Battle of Warsaw: variant w/Urban Cards worked well.Rzhev Overlord: uses Commissar;Rats in a Factory (OL): from Stalingrad pack.

In working towards Sword of Stalingrad, I put together an Overlord page (under my user files) and on boardgamegeek to make sure we play Sword of Stalingrad correctly, which is OL with Commissar, Urban Combat Cards, and Air Strikes.

I'm told Wittman's Final Battle is over, and the next scenario, Sword of Stalingrad (Overlord) will start shortly. There may still be time to sign up for the Vassal ladder if you want to play this scenario one-on-one. See link above. I think we have several weeks to find time to meet our opponent for 2 games.